4.1. Item 300 Aggregate Surface Course

Aggregate Surface Course is one of the predominantly granular materials that are placed on the natural soil to serve as a wearing course or a base for a relatively thin flexible surface. This type of pavement sometime referred to as the low cost road.

It is made of granular base materials that is dense-graded but has strict limits on the amount of fine sand to increase strength and allow drainage.

Material Requirements

Section 300.2 Material Requirements of DPWH Standard Specifications for Highways, Bridges and Airports, Volume II, 2013 Edition.

Required Minimum Testing Requirements:

Tests: For every 300 cu.m. or fraction thereof:

                           1 – G, Grading Test

                           1 – P, Plasicity Test (LIL, PL, PI)

          For every 1500 cu.m. or fraction thereof:

                           1 – Q, Quality Test (Grading, Plasticity and Abrasion)

For every layer of 150 mm of compacted depth / based on the results of compaction trials, at least one (1) group of three (3) in-situ density tests for each 500 sq.m. or fraction thereof.

   For Crushed Gravel or Crushed Stone, 1500 cu.m. or fraction thereof:

                           1 – F, Fractured Face

Equipment Requirements

  • Pneumatic Tire Roller (10 m.t.)
  • Tandem Steel Roller (10.1 m.t.), CC421
  • Tamping Roller
  • Vibratory Roller (10 m.t.), SD100DC
  • Water Truck/Pump (16000 L)
  • Motorized Road Grader (140 hp), G710A

Construction Procedures

  1. Check the delivery of the material to the project site if it conforms to the required specifications prior to its stockpiling and depositing at the road bed.
  2. Identify a trial section in order to attain data regarding the efficiency of the tamping/tandem and vibratory roller and road grader.
  3. Stockpile the aggregate materials beside the proposed roadway.
  4. Push the aggregate materials stockpiled on the sides of the proposed roadway using motorized road grader.
  5. Immediately conduct survey works to check compliance to the required elevation and alignment.
  6. Conduct FDT (Field Density Test) on the finished surface course to determine compliance to the required denseness and thickness prior to placing subsequent courses or surface construction.